Section X. Size of Storage Blocks, Clearances, Heights, and Limitations

TM 38-400/NAVSUP PUB 572/AFMAN 23-210 MCO 4450.14/DLAM 4145.12

Section X. Size of Storage Blocks, Clearances, Heights, and Limitations

6-49. Floor area.

The floor area or individual storage blocks for

combustible materials is indicated in TM 38-410/ DLAM

4145.11/NAVSUP PUB 573/AFR 69-XX/ MCO 4450.XX,

Storage and Handling of Hazardous Materials.

6-50. Height of stacks.

a. General. Height of stacks should not be limited

except as may be required for operations stability and to

maintain clearances and floor load limits. Stack height

limitations listed below may be exceeded and

clearances reduced with the approval of the installation

fire authority.

b. Below automatic sprinkler deflectors. The

height of the stack below automatic sprinkler deflectors

will be limited as follows:

(1) When stack heights do not exceed 15

feet, an 18-inch clearance will be maintained (fig 6-1A).

(2) When stack heights exceed 15 feet, a

36inch clearance will be maintained (fig 6-1B).

c. Below joists, rafters, beams, and roof trusses.

The height of the stack below joists, rafters, beams, and

roof trusses will be limited as follows (fig 6-2):

Figure 6-1. Overhead stack clearance at sprinkler

head.

6-17